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Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt      
Credit facility, maximum borrowing capacity $ 304,300,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Amount of interest costs incurred, capitalized, and expensed      
Interest costs incurred 953,000us-gaap_InterestCostsIncurred 1,019,000us-gaap_InterestCostsIncurred 909,000us-gaap_InterestCostsIncurred
Less: Interest capitalized (98,000)us-gaap_InterestCostsCapitalized (118,000)us-gaap_InterestCostsCapitalized (116,000)us-gaap_InterestCostsCapitalized
Interest expense 855,000us-gaap_InterestExpense 901,000us-gaap_InterestExpense 793,000us-gaap_InterestExpense
Primary revolving line of credit      
Debt      
Credit facility, maximum borrowing capacity 300,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember		    
Primary revolving line of credit | Minimum      
Debt      
Credit facility, interest rate spread (as a percent) 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Facility fees on the available commitment of the facility (as a percent) 0.15%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Primary revolving line of credit | Maximum      
Debt      
Credit facility, interest rate spread (as a percent) 0.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Facility fees on the available commitment of the facility (as a percent) 0.30%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Primary revolving line of credit | LIBOR      
Debt      
LIBOR Rate at end of period (as a percent) 0.16%ssd_DebtInstrumentVariableRateBaseRateAtPeriodEnd
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= ssd_DebtInstrumentVariableRateLIBORMember		    
Credit facility, interest rate basis LIBOR    
Primary revolving line of credit | LIBOR | Minimum      
Debt      
Credit facility, interest rate spread (as a percent) 0.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= ssd_DebtInstrumentVariableRateLIBORMember		    
Primary revolving line of credit | LIBOR | Maximum      
Debt      
Credit facility, interest rate spread (as a percent) 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= ssd_DebtInstrumentVariableRateLIBORMember		    
Primary revolving line of credit | Base rate      
Debt      
Credit facility, interest rate basis base rate    
Other revolving credit lines and long term debt      
Debt      
Total borrowing capacity 4,300,000ssd_TotalBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= ssd_OtherLinesOfCreditAndLongTermDebtMember		    
Credit facility, interest rate low end of range (as a percent) 0.88%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= ssd_OtherLinesOfCreditAndLongTermDebtMember		    
Credit facility, interest rate high end of range (as a percent) 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= ssd_OtherLinesOfCreditAndLongTermDebtMember		    
Total outstanding balances $ 0ssd_OtherAmountOutstanding
/ us-gaap_DebtInstrumentAxis
= ssd_OtherLinesOfCreditAndLongTermDebtMember		 $ 100,000ssd_OtherAmountOutstanding
/ us-gaap_DebtInstrumentAxis
= ssd_OtherLinesOfCreditAndLongTermDebtMember